Aroma diffuser



FIG. 1 is a top plan view of an aroma diffuser showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a first perspective view thereof; and,

FIG. 8 is a second perspective view thereof.

The broken lines in the drawings illustrate portions of the aroma diffuser which form no part of the claimed design. 

CLAIM The ornamental design for an aroma diffuser, as shown and described. 